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Wednesday, December 2, 2009

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Rules of thumbs said that every 50D pipe length results approximately 3 dB Sound Power Level (PWL) attenuation where D is in meter (m). This is presented in "Measures & Technique In Eliminating / Minimizing PWL". This post will base on this simple rule-of-thumbs to generate a simple equation for Sound Power Level attenuation due to pipe length.



Derivation
For every pipe length of 50D, the PWL loss will be 3 dB,

PWL loss per meter of pipe length = 3 / 50D = 0.06/D

Sound Power Level attenuation for any pipe length of L,

PWLLoss,L = 0.06 L/D

where
PWLLoss,L = PWL loss per meter pipe length (dB/m)
L = Pipe length (m)
D = Pipe internal diameter (m)

Following is typical graph for Unit PWL versus pipe ID.



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posted by Webworm, 5:48 AM

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